Lock



July 23, 1929. H, THELENZ 1,721,676

LOCK

Filed/April 7, 192s 2 sheets-sheet 1 il ,www l" "MII" July 23, 1929. H. THELENZ 1,721,676

Stimm? Patented July 23, 1929.

UNITED STATES PATENT OFFICE.

HENRY THELENZ, OF ST. LOUIS, TIIISSOURI.

LOCK.

Application filed April 7,

This invention relates to locks, and more particularly to safety locks. The principal object of the invention is the provision of a lock having a key-bolt and a latch-bolt, neither of which can be retracted in the usual or an obvious manner when both bolts are projected from the lock into the door jamb, so that the saine can not be opened surreptitiously by unauthorized persons who ordinarily would not be familiar with the manner of unlocking the lock. The invention, also, provides that each bolt may be thrown in or out when the other bolt is retracted. The invention, also, provides a lock in which the knob can not retract the latch-bolt when the key-bolt locks the door, and in which the door can be opened by turning the knob when the key-bolt is retracted. Other objects and desirable features of the invention, more or less auxiliary to the foregoing, will be hereinafter more fully pointed out in connection with the following description of a preferred embodiment of the invention and in the appended claims. i

In the accompanyingr drawings .forming part of this specification, in which like numbers of reference denote like parts wherever they occur, i

Figure 1 is a side elevation of the lock of this invention; l I

Figure 2 is a side elevational view of the lock with its detachable side-plate removed to reveal the interior mechanism;

Figures 3 and 4 are sectional view, taken on the lines 3 3 and 4 4, respectively, in Figure 2;

Figure 5 is a front elevation of the lock;

Figure 6 is a sectional View, taken on the irregular line 6 6 in Figure l Figure 7 is a fragmentary view similar to the lower portion of Figure 2, but with the tumblers that overlie the tail of the key-bolt removed;

Figures 8 and 9 are fragmentary views siinilar to the lower portion of Figure 2, but with the parts in different positions;

Figure 10 is a view similar to Figure 2, but with the latch-bolt retracted;

Figures 11 and 12 are views similar to Figures 8 and 9, but with the parts differently positioned;

Figure 13 is a view similar to Figure 2, but with both bolts retracted;

Figure 14 is a view of the bit-end of the key used in the lock; and

AFigure 15 is a side elevation of the saine.

1928. Serial N0. 268,111.

The casing of the lock comprises a faceplate 1, a side-plate 2 aixed thereto in any suitable manner, and a side-plate 3 detachably secured in spaced relation to the sideplate 2 in any suitable manner, as, for instance, by means of screws 4, passing through plate 3 and screwing into spacing-posts 5, borne by the plate 2. Face-plate 1 is apertured in the usual manner to receive the latchbolt 6 and the main bolt oi' key-bolt 7. The lower right portions of the plates 2 and 3 are provided with key-holes 8 and 9, respectively, adapted to tit the bit 16 of the key 11. The upper right portion of the plates 2 and 3 are apertured to provide bearings 12 for the ieduced ends 13 of a knob-spindle or hub 14 of a roll-back 15.

The tail 16 of the main bolt 7 is disposed in spaced relation to both side-plates 2 and 3 and is longitudinally slotted at 17 in its anterior portion to straddle a stud or pin 18, preferably foi-ined integral with the plate 2 and projecting from the inner side thereof, and preferably, also, extending into an apertuie 19 therefor in the plate 3. The right portion of the lower edge of the tail 16 is notched at 2O to receive the middle finger 21 of the bit 10 of the key 11. Posts or studs 22 project from the inner side of the plate 2, are preferably integral therewith, and serve to guide the upper and lower edges, respectively, of the tail 16. Lugs 23 are formed directly opposite one another on opposite sides of the tail 16. Said lugs are adapted to engage H-shaped slots 24 in tumblers 25, 26, 27, and 28, pivoted on the pin 18, tumblers 25 and 26 being interposed between tail 17 and plate 2, and tumbleis 27 and 28 being interposed between tail 17 and plate Tuinblers 25. 26, 27, and 28 have curved recesses 29 in their lower edges in juxtaposition to the keyhole 8. The recesses 29 of the tumblers 25 and 28 are adapted to be engaged by the lingers 30 and 31, respectively, of the key bit 10, and the recesses 29 of the tumblers 26 and 27 are adapted to be engaged by the notches 32 and 33, respectively, of the key bit 10. It will, of course, be understood that more or less t-lian fourtumblers may be employed, with corresponding variations in the number of lingers and notches in the key-bit 10, according to the number of permutations desired. The co-operation of the key 11 with the several tuniblers and bolt 7 is such that, as the key is inserted in the keyhole 9 and turned in a clockwise direction, assuming that the parts are in the position shown in Figure 10, the tuinblers will be lifted until lugs 23 in the left vertical leg 34 of the ll-shaped slot 24 will be directly opposite the horizontal leg 35 of said slot (Figure 11), whence further elevation of the tuinblers will cease and the bolt will be thrown toward the righ-t until fully retracted, by reason of the engagement of key-finger 21 with slot 20, t iereby carrying lugs z3 through leg 35 into the right vertical leg 36 of the H-shaped slot 24 (Figure 12), and, as the key continues to turn, the further cooperation of lingers 30 and 31 and slots 32 and 33 of the key with 'the recesses 29 of the tuinblers will allow the tuinblers to drop under the impulsion of flat springs 37, afhxed v thereto and tending to turn the tuinblers clockwise by reason of their abutment against the lower left post 5, thereby locking the bolt 7 in its retracted position, as shown in Figure 13.

The tail 38 of latch-bolt 6 is adapted to slide against plate 2, and is apertured at 39 to straddle the hub 14 of roll-back lever l5, and is notched at its upper corners, as at 40 and 41, to clear the posts 5 at said corners, which posts act as guides for the horizontal edges of the notches. The lowei` edge of tail 38 is guided by a flange 42, rising from the posterior portion of the inner side of the plate 2. Tail 38 is slotted vertically above the aperture 39, as at 43, to receive a stud 44, affixed to the outer end of the roll-back leverarm 15, that overlies said tail 38. A post 44 projects from the inner side of plate 2 between tails 38 and 16 and has attached thereto and coiled thereabout a iat spring 45, the free end of which extends upwardly over tail 38 and abuts against a lug 46, projecting inwardly from tail 38 at the left of the aperture 39, and thereby tending to throw bolt 6 to the left into shot or projected position.A

Pintle 14 is provided with a square aperture 47 adapted to receive the square shank of the usual knob spindle (not shown). An arm 48 depends from the posterior end of tail 38, being preferably formed integral therewith and in an overlying plane or the plane of the tail 16, so as to cross over the flange 42. Arm 48 extends down to the upper edge of tail 16. and lugs 49 project from the lower ends of said arm at opposite sides thereof. Lugs 49 n engage in T-shaped notches 50 in the upper to retract either or both in the usual or obvious manner. TWith the parts positioned as in Figure 2, the latch-bolt 6 cannot be retracted by turning the door-knob, since lugs 49, having no room to reciprocate horizontally in the upper end of vertical slot 5l, prevents tail 38 of the latch-bolt from being displaced by the knob through the intermediation of roll-back 15. lf an attempt is made to insert the key 11 and to turn it clockwise, it cannot be turned farther than the position shown in dotted lines in Figure 8, by reason of the lugsV 49 then engaging the lower end of slot 51, thereby preventing further rise of the tumblers sufiiciently to enable lugs 23 to leave the vertical positions 34 and to enter the horizontal portions 35 of the irl-shaped slots 24. The bolts may be retracted, however, by turning the key counter-clockwise a predetermined distance, in the present instance a quarter of a turn, as shown in Figure 9, the recessed edges 29 of the tumblers being so contoured thatin this position of the key the tumblers will all have been lifted to enable lugs 49 to enter the horizontal sections 52 of their 'l'- shaped notches 50.Y rlhe door-knob can now be turned clockwise to throw latch-bolt 6 to the right against the impulsion of spring 45, until lugs will have passed beyond th right end of the short edge 54 of said slot 52, as shown in Figure 10. The key may now be turned clockwise while the latch-bolt is held in its retracted position, thereby lifting the tumblers farther until lugs 23 are opposite horizontal slots 35 (Figure 11), whereupon the main bolt 7 is retracted, and lugs z3 passed through horizontal slots 35 into vertical slots 36 (Figure 12), whereupon the tuinblers drop until lugs z3 engage the upper ends of slots 36, as shown in Figure 13. The latch-bolt 6 may now be released, allowing it to move into projected position and carrying lugs 49 into slots 51, as shown in dotted lines in Figure 13. lt will be observer. that the upper ends of slots 36 are so positioned with relation tothe upper edges 53 of slots that lugs 49 cannot rise in the slots 5l, thereby enabling latch-bolt'G to be thrown in and out as long as main bolt 7 is in its retracted position. However, while main bolt 7 can be thrown in or out while latch-bolt 6 is retracted, main bolt 7 cannot be thrown in either direction while latch-bolt 6 is shot or projected, since the rise of the tumblers sufiiciently to enable lugs 23 to enter slots 35 is prevented by rea- 'son of the engagement of the lower ends of slots 51 with the lugs 49, as shown in Figure 8. A

lt will be observed that if ythe recesses 29 were so` shaped that all the tumblers moved together so that the T-slots and VH-slots of any tumbler always coincided with the corresponding slots of its companions, it might be possible, with the parts in the position shown in Figure 2, to present lugs 49 to the llO vslots 52 by turning the key a sufficient distance in a clockwise direction, as well as by turning the key a quarter-turn counterclockwise, as heretofore described, and thereby similarly allowing the latch-bolt to be held retracted preparatory to retracting the main bolt. However, it is preferable to so shape the recessed edges 29 that the slots 52 of all tumblers can not be made to coincide with bot-h bolts projected unless the key is turned counter-clockwise to the predetermined degree. It will be observed that for this purpose the recessed edge 29 of tumbler 28 is eX- tended to overlap the adjacent guide-post 22, while the edges 29 of the tumblers 25, 26, and 2T are adapted to clear the post 22.

Having thus fully described this invention, I hereby reserve the benefit of all changes in forni, arrangement, order, or use of parts, as it s evident that many minor changes may be made therein without departing from the spirit of this invention or the scope of the following claims.

I claim:

l. In a lock, a pair of bolts, and a tumbler adapted optionally to lock one of said bolts in either its projected or retracted position, and the other of said bolts being adapted for optionally rendering said tumbler operable or inoperable for releasing said one bolt.

2. In a lock, a pair of bolts, and a tumbler adapted optionally for locking one of said bolts in either projected or retracted position, and the other of said bolts rendering the tumbler inoperable for releasing said one bolt when said other bolt is in its projected position.

3. In a lock, a bolt, a tumbler for locking said bolt against actuation, and shiftable means for optionally preventing the movement of the tumbler from its bolt-locking positions, said tumbler being, also, adapted normally to lock said shiftable means, but to release the latter when the tumbler is in a predetermined bolt-locking position.

4. In a lock, a key-operated bolt, a keyoperated tumbler for locking said bolt against actuation, and shiftable means for optionally preventing the movement of the tumbler from its bolt-locking positions, said tumbler being, also, adapted normally to lock said shiftable means, but to release the latter when the key is shifted to a predetermined position lion a direction abnormal for throwing said olt.

5. In a lock, a key-operated bolt, a plurality of key-operated tumblers for locking said bolt against actuation, and shiftable means for optionally preventing the movements of the tumblers from their bolt-locking positions, said tumblers being, also, adapted normally to lock said shiftable means, but to cooperate together to release the latter only when the key is shifted to a predetermined position in a direction abnormal for throwing said key-bolt.

6. In a lock, a pair of bolts, and tumbler means co-operating therewith, said tumbler means simultaneously locking both bolts against retraction when they are in their projected positions, and shiftable to release either bolt after the other bolt has been retracted.

7. In a lock, a main bolt, a tumbler for locking said bolt against actuation, and a latch-bolt adapted, when in its projected position, to prevent the movement of the tumbler from its bolt-locking positions, said tumbler, also, being adapted normally to lock said latch-bolt against actuation, but to release the latter when the tumbler is in a predetermined bolt-locking position.

8. In a lock, a key-bolt, a key-operated tumbler for locking said bolt against actuation, and a latch-bolt adapted, when in its projected posit-ion, to prevent the movement of the tumbler from its bolt-locking positions, said tumbler being, also, adapted normally to lock the latch-bolt against actuation, but to release the latter when the key is shifted to a predetermined position in a direction abnormal for throwing the key-bolt.

9. In a lock, a key-bolt, a plurality of keyoperated tumblers for locking the key-bolt against actuation, and a latch-bolt adapted, when in its projected position, to prevent the movement of the tumblers from their boltlocking positions, said tumblers being, also, adapted normally to lock the latch-bolt against actuation, but to co-operate together to release the latter only when the key is shifted to a predetermined position in a direction abnormal for throwing the key-bolt.

In testimonyv whereof I hereunto affix my signature.

HENRY THELENZ. 

